Mt. Koya holds the anniversary of founding in every 50 years. Because 2015 was the 1200th year, many tourists visited Mt. Koya. In this paper, we analyzed this anniversary using big data of the transit information service. These data have a departure and arrival place and the hope time of each tourist. From the comparison numbers of getting-off persons of the station and traffic of the road with the big data, we found the strong correlation and a highly precise straight line approximation in both. As result of association analysis of other spots visiting with Mt. Koya, the Japanese tourist gaze changed before and after 1200th anniversary of founding.